Undescended Testes

What is cryptorchidism (undescended testes)?

Cryptorchidism (or undescended testes) is a condition seen in newborns when one or both of the male testes have not passed down into the scrotal sac. Ten percent of cases are bilateral (involve both testes). Cryptorchidism is more commonly seen in premature males because the testes do not descend from the abdomen to the scrotal sac until the seventh month of fetal development.

What causes undescended testes?

Undescended testes may occur for several reasons. While prematurity is a leading cause, other causes may include hormonal disorders, spina bifida, retractile testes (a reflex that causes a testicle to move back and forth from the scrotum to the groin), or testicular absence.

Who is affected by undescended testes?

According to pediatric urologists:

Undescended testes occurs in approximately 3 to 5 percent of male infants.

What are the symptoms of undescended testes?

A nonpalpable testis (unable to feel upon examination) is the most common symptom of cryptorchidism. However, each child may experience symptoms differently. Symptoms of cryptorchidism may resemble other conditions or medical problems. Always consult your child's doctor for a diagnosis.

How are undescended testes diagnosed?

Diagnosis of undescended testes is made based on a complete medical history and physical examination.

What is the treatment for undescended testes?

Three quarters of undescended testes usually resolve by 3 months of age and 99 percent resolve by one year without any intervention. Resolution occurs as the testicles (or testes) descend from the inguinal canal (a small internal passageway that runs along the abdomen near the groin) into the scrotal sac.

Specific treatment for undescended testes will be determined by your child's doctor based on:

Hormonal therapy. Administration of certain hormones may stimulate the production of testosterone, which helps the testes descend into the scrotal sac. This is not routinely used for treatment of truly undescended testes.

Surgical repair. A surgical repair to locate the undescended testicle and advance it to the scrotal sac may be recommended by your child's doctor. This surgery, called orchiopexy, is usually performed between months 6 and 18 and is successful in 98 percent of children with this condition.

If cryptorchidism is not repaired, the following complications may occur as your child grows and matures:

Infertility (most common in bilateral cases, where both testes are affected)

Risk of testicular cancer increases considerably by age 30 or 40

Inguinal hernia (a weakened area in the lower abdominal wall or inguinal canal where intestines may protrude)

Testicular torsion (a painful twisting of the testes that can decrease blood supply to the testes)

Psychological consequences of an empty scrotum

Please consult your doctor with any questions or concerns you may have regarding this condition.

To request an appointment with a physician at St. Louis Children's Hospital, call 314.454.5437 or 800.678.5437 or email us. For additional resources about undescended testes, contact our Family Resource Center.